Exam 3

Question 1

Dyenin and kinesin interact with

Answer 1

microtubules

Question 2

Myosin interacts with

Answer 2

microfilaments

Question 3

Intermediate filaments

Answer 3

no role in movement

Question 4

Extracellular matrix function

Answer 4

holds cells into tissues, forms basal lamina

Question 5

Basal lamina function

Answer 5

separates epithelial (layered) cells from the rest of the body

Question 6

ECM is __ from cells by __

Answer 6

secreted; exocytosis

Question 7

Term for plasma membrane permeability

Answer 7

selectively permeable

Question 8

What chemically modifies proteins in the membrane

Answer 8

glycoproteins

Question 9

Membrane contains what in addition to phospholipids

Answer 9

cholesterol and glycolipids

Question 10

Mobility of membrane proteins and lipids

Answer 10

Not fixed; will move laterally in the plane of the membrane (fluid mosaic)

Question 11

Name for part polar and part nonpolar

Answer 11

ampipathic

Question 12

Area of phospholipid monolayer is __ the area of the starting cells

Answer 12

twice

Question 13

Which part of the bilayer forms the central barrier between inside and outside cell

Answer 13

Hydrophobic tails

Question 14

Excluding holes, pores and proteins the membrane is permeable to __ and impermeable to __

Answer 14

nonpolar and small molecules; polar, large, and charged molecules

Question 15

Integral membrane proteins

Answer 15

span across membrane; tightly bound

Question 16

3 domains of integral membrane proteins

Answer 16

intracellular, transmembrane, extracellular

Question 17

Peripheral membrane proteins

Answer 17

only on one surface (either extra- or intracellular); loosely bound

Question 18

Membranes are more or less fluid at high temps

Answer 18

more fluid

Question 19

Unsaturated and shorter fatty acids chains

Answer 19

increase membrane fluidity

Question 20

Saturated and longer fatty acid chains

Answer 20

decrease membrane fluidity

Question 21

Relationship between temp and fluidity

Answer 21

direct

Question 22

If temp decreases cell will make fatty acids with more

Answer 22

unsaturated and shorter chains

Question 23

If temp increases cell will make fatty acids with more

Answer 23

saturated and longer chains

Question 24

Are cold- or warm-blooded animals healthier

Answer 24

cold-blooded

Question 25

Simple diffusion

Answer 25

moves down concentration gradient

Question 26

Facilitated diffusion

Answer 26

charged or large polar molecules

Question 27

Channel proteins

Answer 27

always open to allow constant movement of particles

Question 28

Carrier proteins

Answer 28

open and close to permit movement of molecules across the membrane

Question 29

Active transport

Answer 29

moves against concentration gradient

Question 30

hypertonic solution

Answer 30

higher concentration of solutes outside cell

Question 31

cell placed in hypertonic sloution

Answer 31

shrivels (due to loss of water)

Question 32

hypotonic solution

Answer 32

higher concentration of solutes inside cell

Question 33

cell placed in hypotonic solution

Answer 33

swells and lyses (bursts) due to gain of water

Question 34

Impermeable connections outside cells

Answer 34

tight junctions

Question 35

Close connections between 2 cells; provide mechanical strength

Answer 35

Anchoring junctions

Question 36

Desmosomes

Answer 36

Connect cytoskeleton of 2 cells

Question 37

Hemidemosomes

Answer 37

Connect cytoskeleton of a cell to the ECM

Question 38

Allow molecules and signals to move between cells

Answer 38

Communicating junctions

Question 39

Communicating junctions in animals

Answer 39

Gap junctions

Question 40

Communicating junctions in plants

Answer 40

Plasmodesmata